我在使用网格中的两个列解决几个错误时遇到了问题。我创建了一个包含几个表的示例数据库，并创建了一个jqGrid测试应用程序来显示数据。我想对网格上的数据进行一些搜索/过滤。我使用了Oleg的MVC搜索和过滤示例。我的前两列（ID，事件标题）工作得很完美，但之后的任何专栏都不起作用。我确信我错过了一些东西，却看不到我错过的东西。任何帮助都会很棒。以下是代码。
客户端：
var myGrid = $('#list'),
decodeErrorMessage = function (jqXHR, textStatus, errorThrown) {
var html, errorInfo, i, errorText = textStatus + '\n' + errorThrown;
if (jqXHR.responseText.charAt(0) === '[') {
try {
errorInfo = $.parseJSON(jqXHR.responseText);
errorText = "";
for (i = 0; i < errorInfo.length; i++) {
if (errorText.length !== 0) {
errorText += "<hr />";
}
errorText += errorInfo[i].Source + ": " + errorInfo[i].Message;
}
}
catch (e) { }
} else {
html = /<body.*?>([\s\S]*)<\/body>/.exec(jqXHR.responseText);
if (html !== null && html.length > 1) {
errorText = html[1];
}
}
return errorText;
};
myGrid.jqGrid({
url: '../Admin/GetEventsGridData/',
datatype: 'json',
mtype: 'POST',
colNames: ['ID', 'Event Title', 'Series', 'Occ', 'Department' ],
colModel: [
{ name: 'EVENT_ID', index: 'EVENT_ID', editable: true, editoptions: { readonly: 'readonly' }, width: 25, searchoptions: { sopt: ['eq', 'ne', 'lt', 'le', 'gt', 'ge']} },
{ name: 'EVENT_TITLE', index: 'EVENT_TITLE', editable: true, width: 205, searchoptions: { sopt: ['cn', 'nc', 'bw', 'bn', 'eq', 'ne', 'ew', 'en', 'lt', 'le', 'gt', 'ge']} },
{ name: 'SERIES_DESCRIPTION', index: 'SERIES_DESCRIPTION', editable: true, width: 30, searchoptions: { sopt: ['cn', 'nc', 'bw', 'bn', 'eq', 'ne', 'ew', 'en', 'lt', 'le', 'gt', 'ge']} },
{ name: 'OCCURRENCES', index: 'OCCURRENCES', editable: true, width: 20, searchoptions: { sopt: ['eq', 'ne', 'lt', 'le', 'gt', 'ge']} }
{ name: 'DEPARTMENT_NAME', index: 'DEPARTMENT_NAME', editable: true, width: 100, searchoptions: { sopt: ['cn', 'nc', 'bw', 'bn', 'eq', 'ne', 'ew', 'en', 'lt', 'le', 'gt', 'ge']} }
],
pager: '#pager',
autowidth: true,
height: 'auto',
rowNum: 10,
rowList: [5, 10, 20, 50],
sortname: 'EVENT_ID',
sortorder: "desc",
viewrecords: true,
caption: 'Events',
jsonReader: { cell: "" },
loadError: function (jqXHR, textStatus, errorThrown) {
// remove error div if exist
$('#' + this.id + '_err').remove();
// insert div with the error description before the grid
myGrid.closest('div.ui-jqgrid').before(
'<div id="' + this.id + '_err" style="max-width:' + this.style.width +
';"><div class="ui-state-error ui-corner-all" style="padding:0.7em;float:left;"><span class="ui-icon ui-icon-alert" style="float:left; margin-right: .3em;"></span><span style="clear:left">' +
decodeErrorMessage(jqXHR, textStatus, errorThrown) + '</span></div><div style="clear:left" /></div>')
},
loadComplete: function () {
// remove error div if exist
$('#' + this.id + '_err').remove();
}
});
myGrid.jqGrid('navGrid', '#pager', { add: true, edit: true, del: true, refresh: true },
updateDialog, // add a record
updateDialog, // edit a record
updateDialog, // delete a record
{multipleSearch: true, overlay: false, width: 460 });
myGrid.jqGrid('filterToolbar', { stringResult: true, searchOnEnter: true, defaultSearch: 'cn' });
myGrid.jqGrid('navButtonAdd', '#pager',
{ caption: "Filter", title: "Toggle Searching Toolbar",
buttonicon: 'ui-icon-pin-s',
onClickButton: function () { myGrid[0].toggleToolbar(); }
});
这是我的服务器端：
using System;
using System.Collections.Generic;
using System.Data.Objects;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Web.Mvc;
using System.Web.Script.Serialization;
using Newtonsoft.Json;
//using System.Data.Entity.Infrastructure;
using CATS.Models;
namespace CATS.Controllers
{
// to send exceptions as json we define [HandleJsonException] attribute
public class ExceptionInformation
{
public string Message { get; set; }
public string Source { get; set; }
public string StackTrace { get; set; }
}
public class HandleJsonExceptionAttribute : ActionFilterAttribute
{
public override void OnActionExecuted(ActionExecutedContext filterContext)
{
if (filterContext.HttpContext.Request.IsAjaxRequest() && filterContext.Exception != null)
{
filterContext.HttpContext.Response.StatusCode =
(int)System.Net.HttpStatusCode.InternalServerError;
var exInfo = new List<ExceptionInformation>();
for (Exception ex = filterContext.Exception; ex != null; ex = ex.InnerException)
{
PropertyInfo propertyInfo = ex.GetType().GetProperty("ErrorCode");
exInfo.Add(new ExceptionInformation()
{
Message = ex.Message,
Source = ex.Source,
StackTrace = ex.StackTrace
});
}
filterContext.Result = new JsonResult() { Data = exInfo };
filterContext.ExceptionHandled = true;
}
}
}
public class Filters
{
public enum GroupOp
{
AND,
OR
}
public enum Operations
{
eq, // "equal"
ne, // "not equal"
lt, // "less"
le, // "less or equal"
gt, // "greater"
ge, // "greater or equal"
bw, // "begins with"
bn, // "does not begin with"
//in, // "in"
//ni, // "not in"
ew, // "ends with"
en, // "does not end with"
cn, // "contains"
nc // "does not contain"
}
public class Rule
{
public string field { get; set; }
public Operations op { get; set; }
public string data { get; set; }
}
public GroupOp groupOp { get; set; }
public List<Rule> rules { get; set; }
private static readonly string[] FormatMapping = {
"(it.{0} = @p{1})", // "eq" - equal
"(it.{0} <> @p{1})", // "ne" - not equal
"(it.{0} < @p{1})", // "lt" - less than
"(it.{0} <= @p{1})", // "le" - less than or equal to
"(it.{0} > @p{1})", // "gt" - greater than
"(it.{0} >= @p{1})", // "ge" - greater than or equal to
"(it.{0} LIKE (@p{1}+'%'))", // "bw" - begins with
"(it.{0} NOT LIKE (@p{1}+'%'))", // "bn" - does not begin with
"(it.{0} LIKE ('%'+@p{1}))", // "ew" - ends with
"(it.{0} NOT LIKE ('%'+@p{1}))", // "en" - does not end with
"(it.{0} LIKE ('%'+@p{1}+'%'))", // "cn" - contains
"(it.{0} NOT LIKE ('%'+@p{1}+'%'))" //" nc" - does not contain
};
internal ObjectQuery<T> FilterObjectSet<T>(ObjectQuery<T> inputQuery) where T : class
{
if (rules.Count <= 0)
return inputQuery;
var sb = new StringBuilder();
var objParams = new List<ObjectParameter>(rules.Count);
foreach (Rule rule in rules)
{
PropertyInfo propertyInfo = typeof(T).GetProperty(rule.field);
if (propertyInfo == null)
continue; // skip wrong entries
if (sb.Length != 0)
sb.Append(groupOp);
var iParam = objParams.Count;
sb.AppendFormat(FormatMapping[(int)rule.op], rule.field, iParam);
ObjectParameter param;
switch (propertyInfo.PropertyType.FullName)
{
case "System.Int32": // int
param = new ObjectParameter("p" + iParam, Int32.Parse(rule.data));
break;
case "System.Int64": // bigint
param = new ObjectParameter("p" + iParam, Int64.Parse(rule.data));
break;
case "System.Int16": // smallint
param = new ObjectParameter("p" + iParam, Int16.Parse(rule.data));
break;
case "System.SByte": // tinyint
param = new ObjectParameter("p" + iParam, SByte.Parse(rule.data));
break;
case "System.Single": // Edm.Single, in SQL: float
param = new ObjectParameter("p" + iParam, Single.Parse(rule.data));
break;
case "System.Double": // float(53), double precision
param = new ObjectParameter("p" + iParam, Double.Parse(rule.data));
break;
case "System.Boolean": // Edm.Boolean, in SQL: bit
param = new ObjectParameter("p" + iParam,
String.Compare(rule.data, "1", StringComparison.Ordinal) == 0 ||
String.Compare(rule.data, "yes", StringComparison.OrdinalIgnoreCase) == 0 ||
String.Compare(rule.data, "true", StringComparison.OrdinalIgnoreCase) == 0);
break;
default:
// TODO: Extend to other data types
// binary, date, datetimeoffset,
// decimal, numeric,
// money, smallmoney
// and so on
param = new ObjectParameter("p" + iParam, rule.data);
break;
}
objParams.Add(param);
}
ObjectQuery<T> filteredQuery = inputQuery.Where(sb.ToString());
foreach (var objParam in objParams)
filteredQuery.Parameters.Add(objParam);
return filteredQuery;
}
}
[HandleJsonException]
public class AdminController : Controller
{
//
// GET: /Admin/
public ActionResult Admin()
{
ViewBag.PageTitle = "Admin";
return View();
}
public ActionResult GetEventsGridData(string sidx, string sord, int page, int rows, bool _search, string filters)
{
var context = new CATEntities();
//var context = new CATContext();
//var serializer = new JavaScriptSerializer();
//var objectContext = ((IObjectContextAdapter)context).ObjectContext;
//var eventset = objectContext.CreateObjectSet<EVENT>();
Filters f = (!_search || string.IsNullOrEmpty(filters)) ? null : JsonConvert.DeserializeObject<Filters>(filters);
ObjectQuery<EVENT> filteredQuery = (f == null ? context.EVENT : f.FilterObjectSet(context.EVENT)); // (ObjectQuery<EVENT>)eventset)
filteredQuery.MergeOption = MergeOption.NoTracking; // we don't want to update the data
var totalRecords = filteredQuery.Count();
var pagedQuery = filteredQuery.Skip("it." + sidx + " " + sord, "@skip",
new ObjectParameter("skip", (page - 1) * rows))
.Top("@limit", new ObjectParameter("limit", rows));
// to be able to use ToString() below which does NOT exist in the LINQ to Entity
var queryDetails = (from item in pagedQuery
select new { item.EVENT_ID, item.EVENT_TITLE, item.EVENT_SERIES.SERIES_DESCRIPTION, item.OCCURRENCES, item.DEPARTMENT.DEPARTMENT_NAME }).ToList();
return Json(new
{
total = (totalRecords + rows - 1) / rows,
page,
records = totalRecords,
rows = (from item in queryDetails
select new[] {
item.EVENT_ID.ToString(),
item.EVENT_TITLE,
item.SERIES_DESCRIPTION,
item.OCCURRENCES.ToString()
item.DEPARTMENT_NAME
}).ToList()
});
}
public ActionResult UpdateGridData(FormCollection formCollection)
{
return Json(JsonRequestBehavior.AllowGet);
}
}
}
我的问题是我在Occurrences列上收到此错误：
System.Data.Entity: The argument types 'Edm.Int32' and 'Edm.String' are incompatible for this operation. Near equals expression, line 6, column 17.
Occurrences列中的所有数据都是Integer数据。这告诉我它正在寻找Integer数据，但我发送的是String数据。此列与EVENT_ID列类似。不知道我在哪里错过了断开连接。
系列列也有问题。在Event表上，Series列是我的系列表的外键ID。从那里我得到系列描述。部门栏目类似。当我尝试对这两列进行搜索/过滤时，我收到此错误：
System.Data.Entity: You must specify a valid predicate for filtering the results. Parameter name: predicate
我错过了一些东西，但对于我的生活，我无法找到它。
答案 0 :(得分：0)
尝试此代码....
数据是实体的集合...... cols是List Entity.PropertyName
var filterExpr = jqGridHelper.SearchDelgate（filters，cols）;
var data = EntityRepository.Get（）。Where（filterExpr）.ToList（）;
public static Expression<Func<T, bool>> SearchDelgate<T>(string jsonData, List<JqGridColModel> colmodels) where T : Entity
{
var dateCols = colmodels.Where(x => x.colType == "System.DateTime").Select(x => x.index).ToList();
var filter = GetFilter(jsonData, dateCols);
return GetFilterExpr<T>(filter, null, null);
}
private static Expression<Func<T, bool>> GetFilterExpr<T>(JqGridFilter filter, string searchOpr, Expression<Func<T, bool>> expr) where T : Entity
{
var rules = filter.rules;
searchOpr = searchOpr ?? GetOperator(filter.groupOp);
Expression<Func<T, bool>> ruleexpr = null;
rules.ForEach(x =>
{
ruleexpr = Extentions.ToExpression<T>(GetOperator(filter.groupOp), x.field, GetOperator(x.op), x.data, ruleexpr);
});
if (!expr.IsNull())
ruleexpr = searchOpr == "&&" ? expr.And(ruleexpr) : expr.Or(ruleexpr);
if (!filter.groups.IsNull())
{
Expression<Func<T, bool>> groupexpr = null;
filter.groups.ForEach(x =>
{
groupexpr = GetFilterExpr<T>(x, searchOpr, groupexpr);
});
expr = searchOpr == "&&" ? ruleexpr.And(groupexpr) : ruleexpr.Or(groupexpr);
}
else
expr = ruleexpr;
return expr;
}
private static JqGridFilter GetFilter(string jsonData, List<string> dateCols)
{
var temp = Deserialize<Dictionary<string, object>>(jsonData);
return CreateFilter(temp, dateCols);
}
private static JqGridFilter CreateFilter(object rawData, List<string> dateCols)
{
var temp = rawData.ExplicitCast<Dictionary<string, object>>();
var groupOp = temp["groupOp"];
var rulesData = temp["rules"];
var groupsdata = temp.Keys.Contains("groups") ? temp["groups"] : null;
JqGridFilter filter = new JqGridFilter();
filter.groupOp = groupOp.ToString();
var rules = new List<JqGridFilterRule>();
foreach (var obj in rulesData.ExplicitCast<ArrayList>())
{
JqGridFilterRule rule = new Core.JqGridFilterRule();
rule.DictToObject(obj);
setDateCols(rule, rules, dateCols);
// rules.Add(rule);
}
if (!rules.IsNull())
filter.rules = rules;
if (!groupsdata.IsNull())
{
var groups = new List<JqGridFilter>();
foreach (var obj in groupsdata.ExplicitCast<ArrayList>())
{
groups.Add(CreateFilter(obj, dateCols));
}
if (!groups.IsNull())
filter.groups = groups;
}
return filter;
}
private static string GetOperator(string op)
{
string searchOper = "==";
switch (op)
{
case "eq": //equals
case "ew": //equals with
searchOper = "=="; break;
case "ne": //notequal
searchOper = "!="; break;
//case "bw": //begins with
// searchOper = "=="; break;
//case "bn": //does not begin with
// searchOper = "=="; break;
//case "en": //does not ends with
// searchOper = "=="; break;
case "cn": //contains
searchOper = "LIKE"; break;
case "nc": //does not contains
searchOper = "NOTLIKE"; break;
//case "nu": //is null
// searchOper = "=="; break;
//case "nn": //is not null
//searchOper = "=="; break;
//case "in": //is in
// searchOper = "=="; break;
//case "ni": //is not in
// searchOper = "=="; break;
case "lt": //less
searchOper = "<"; break;
case "le": //less or equal
searchOper = "<="; break;
case "gt": //greater
searchOper = ">"; break;
case "ge": //greater or equal
searchOper = ">="; break;
case "AND": //greater or equal
searchOper = "&&"; break;
case "OR": //greater or equal
searchOper = "||"; break;
default:
searchOper = "=="; break;
}
return searchOper;
}
private static void setDateCols(JqGridFilterRule obj, List<JqGridFilterRule> rules, List<string> dateCols)
{
if (dateCols.Contains(obj.field) && obj.op == "eq")
{
JqGridFilterRule obj_ge = new JqGridFilterRule();
obj_ge.field = obj.field;
obj_ge.op = "ge";
obj_ge.data = Convert.ToDateTime(obj.data).ToShortDateString();
JqGridFilterRule obj_lt = new JqGridFilterRule();
obj_lt.field = obj.field;
obj_lt.op = "lt";
obj_lt.data = Convert.ToDateTime(obj.data).AddDays(1).ToShortDateString();
rules.Add(obj_lt);
rules.Add(obj_ge);
}
else
rules.Add(obj);
}
public static Expression<Func<T, bool>> ToExpression<T>(string andOrOperator, string propName, string opr, string value, Expression<Func<T, bool>> expr = null)
{
Expression<Func<T, bool>> func = null;
try
{
ParameterExpression paramExpr = Expression.Parameter(typeof(T));
var arrProp = propName.Split('.').ToList();
Expression binExpr = null;
string partName = string.Empty;
arrProp.ForEach(x =>
{
Expression tempExpr = null;
partName = partName.IsNull() ? x : partName + "." + x;
if (partName == propName)
{
var member = NestedExprProp(paramExpr, partName);
var type = member.Type.Name == "Nullable`1" ? Nullable.GetUnderlyingType(member.Type) : member.Type;
tempExpr = ApplyFilter(opr, member, Expression.Convert(ToExprConstant(type, value), member.Type));
}
else
tempExpr = ApplyFilter("!=", NestedExprProp(paramExpr, partName), Expression.Constant(null));
if (binExpr != null)
binExpr = Expression.AndAlso(binExpr, tempExpr);
else
binExpr = tempExpr;
});
Expression<Func<T, bool>> innerExpr = Expression.Lambda<Func<T, bool>>(binExpr, paramExpr);
if (expr != null)
innerExpr = (andOrOperator.IsNull() || andOrOperator == "And" || andOrOperator == "AND" || andOrOperator == "&&") ? innerExpr.And(expr) : innerExpr.Or(expr);
func = innerExpr;
}
catch { }
return func;
}
private static MemberExpression NestedExprProp(Expression expr, string propName)
{
string[] arrProp = propName.Split('.');
int arrPropCount = arrProp.Length;
return (arrPropCount > 1) ? Expression.Property(NestedExprProp(expr, arrProp.Take(arrPropCount - 1).Aggregate((a, i) => a + "." + i)), arrProp[arrPropCount - 1]) : Expression.Property(expr, propName);
}
private static Expression ToExprConstant(Type prop, string value)
{
if (value.IsNull())
return Expression.Constant(value);
object val = null;
switch (prop.FullName)
{
case "System.Guid":
val = value.ToGuid();
break;
default:
val = Convert.ChangeType(value, Type.GetType(prop.FullName));
break;
}
return Expression.Constant(val);
}
private static Expression ApplyFilter(string opr, Expression left, Expression right)
{
Expression InnerLambda = null;
switch (opr)
{
case "==":
case "=":
InnerLambda = Expression.Equal(left, right);
break;
case "<":
InnerLambda = Expression.LessThan(left, right);
break;
case ">":
InnerLambda = Expression.GreaterThan(left, right);
break;
case ">=":
InnerLambda = Expression.GreaterThanOrEqual(left, right);
break;
case "<=":
InnerLambda = Expression.LessThanOrEqual(left, right);
break;
case "!=":
InnerLambda = Expression.NotEqual(left, right);
break;
case "&&":
InnerLambda = Expression.And(left, right);
break;
case "||":
InnerLambda = Expression.Or(left, right);
break;
case "LIKE":
InnerLambda = Expression.Call(left, typeof(string).GetMethod("Contains", new Type[] { typeof(string) }), right);
break;
case "NOTLIKE":
InnerLambda = Expression.Not(Expression.Call(left, typeof(string).GetMethod("Contains", new Type[] { typeof(string) }), right));
break;
}
return InnerLambda;
}
public static Expression<Func<T, object>> PropExpr<T>(string PropName)
{
ParameterExpression paramExpr = Expression.Parameter(typeof(T));
var tempExpr = Extentions.NestedExprProp(paramExpr, PropName);
return Expression.Lambda<Func<T, object>>(Expression.Convert(Expression.Lambda(tempExpr, paramExpr).Body, typeof(object)), paramExpr);
}
public static IQueryOver<T, T> OrderBy<T>(this IQueryOver<T, T> Collection, string sidx, string sord)
{
return sord == "asc" ? Collection.OrderBy(NHibernate.Criterion.Projections.Property(sidx)).Asc : Collection.OrderBy(NHibernate.Criterion.Projections.Property(sidx)).Desc;
}
public static Expression<Func<T, TResult>> And<T, TResult>(this Expression<Func<T, TResult>> expr1, Expression<Func<T, TResult>> expr2)
{
var invokedExpr = Expression.Invoke(expr2, expr1.Parameters.Cast<Expression>());
return Expression.Lambda<Func<T, TResult>>(Expression.AndAlso(expr1.Body, invokedExpr), expr1.Parameters);
}
public static Expression<Func<T, bool>> Or<T>(this Expression<Func<T, bool>> expr1, Expression<Func<T, bool>> expr2)
{
var invokedExpr = Expression.Invoke(expr2, expr1.Parameters.Cast<Expression>());
return Expression.Lambda<Func<T, bool>>(Expression.OrElse(expr1.Body, invokedExpr), expr1.Parameters);
}